FUNCTION: [Summary is not available for the mouse gene. This summary is for the human ortholog.] This gene encodes a protein containing four conserved nuclear localization signals. The encoded protein functions in eye, tooth, craniofacial and brain development, and it can regulate actin remodeling and cell morphology. Mutations in this gene have been shown to cause Nance-Horan syndrome, and also X-linked cataract-40. Alternatively spliced transcript variants encoding different isoforms have been described for this gene. [provided by RefSeq, May 2014] PHENOTYPE: Heterozygous females exhibit variable and patchy lens opacity. Homozygous females and hemizygous males exhibit complete lens opacity associated with progressive degeneration of primary fibers beginning around embryonic day 15. [provided by MGI curators]